Chuck.



v.1 WAHLSTROMM GHUGK.

APPLICATION FILED OCT. 14:, 1910.

Patented July 4, 1911.

. M M a 5 E e 8 a T UNITED sr irns. PATENT. ()FFICE.

vEnNEa J. wAnLs'rnoM, or BRooKLYN gnaw roan, assienoa' or oNn-H ALF'To BEBNHABD T. BU'BCHARDI, BROOKLYN, NEW YORK,

f CHUCK.

To all whom it may concern."

Be it known that I, VERNER .1. Wis

STROM, a, citizen of the United States, "reside ing at Brooklyn, county of Kings, and State of New York, have invented a new 'anduse' ful Improvement in Chucks, offwhich the following is a specification.

This invention relates to an improvement" in chucks, and it has for its main object the production of a device of this general-char acter of increased capacity and efiiciency.

With these and other objects notspecifitions; which will be hereinafter fully de scribed and then specifically whichjlike characters .01: reference indicate the same parts, Figure 1 is a central sec-' tional view of a device constructed'in accordance with the invention, Fig. 2' is a sec tional view taken on the line 2-2 in Fig, 1-, withthe shank omitted, Figs. 3 and 4 are sectional views taken on the line 3'3 in Fig. "1 showingthe jaws in difi'erent posi'-' tions, *igs. 5 and 6 are plan views ofone of" I the jaws showing the parts in different posi-- tions Fig 7 is a sectional view taken on the line -7 in Fig. 5, and Fig. 8 is .anuend other machine tool. provided with an annular shell 13 surroundelevation of the jaw shown in Figs. 5, 6

and i In the device selected to illustrate the in- Vention, there is provided a body 9 having three radial slots 10 cut through its wall'to a central aperture 11 adapted to receive a" tool shank. -The slots are also inclined from the axis of the aperture 11. Thesbody is further provided with a shank .12, driven or otherwise fastenedtherein, for the purpose of attaching the device to a drill'press or The device is further the body and the other to the shell, as indicated in Fig. 1. That portion of the device so far described is old and well known pointed out 'in '7 the claims. hereunto appends i In the accompanying drawings which form a part of this specification and in- Specification bf Letters Patent, P t'nt July 4, 1911; I aation filed "October 14, 1910. YSeIiallNahBGflS I 1 in theart, and a more detailed description of its,construction is deemed unnecessary to a central aperture 11,.thereis provided a jaw full understanding ofthe present invention",

or plurality of jaw'sworkingin the slots 10."

Each of the jaws, marked '20-, has a-flat face 21 on its outer end,,and arecess 22 on its 'For the: purpose [of .producing'ja inovement of each .jaw' toward the axisof'the shell and centen of the device, there is provided a floatin'g wedge interposed between the jaw and one of theinternal floating wedge, marked 23, has'a-fiatface engagingthe rear face 21 of the jaw and' a curvedface' 25 engaging the "internal cam spring 19, the internal cam face slides by the inward toward During thismovement,- the flat face 24 of the wedge,- slides onthe flat face 21' of the jaw. Owing to the angle at which these faces are out and to the inclination of the slots 10, a

inner encl'the purpose of which will be here-' jinafter explained. i cally mentioned in view, the invention con I sists in certain constructions and combinal cam faces 14. This 3 "Z5 face 14. When the shell '13 is rotated-bythe" curved face 25 ofthe wedge and forces it the axis of the devicew small movement, produced by the internal cam face, is translated into, aerelatively large" movementof the jaw radially inward and.

downward toward the center ofthe-chuck. Th s can be best understood by reference to Figs. 3 and 4. In Fig. 3,. the jawsare shown in wide open .positionand ready to receive between them a drill shank of the largest size"withirtthe' capacityof the device. In 1 Fig. 4, the aws are shown in'their-inner, or closed posit on one. very small drill shank.

A tool gripper-carried by the jawis emmental rocking gripper and isseated imthe recess 22 of the jaw, as clearly showirirr- Figs. 3 and 4. 'It will of course be understood that each jaw carries a gripper.

gripper is provided with fingersl27fwhiclij interlock with fingers 28 on the jaw 1 26." The bearing face of each gripper is em,

I bycontact a toolshank, caused to tightly clanig vspringis secured in the jaw. and the other end in the gripper, Figs. 5 and 7.

When a plurality of jaws and (grippers are employed, each gripper is provi ed with an upwardly projecting stu d'fi which engages 'oneof the slots 35 cut. in the lower face of a conical plate 36 centrally located in the upper-part of the aperture 11. The

mechanism just described serves to control the rocking movement of the several grip pers" and insure uniform movement ofi'the sameso that a' tool shank will always be centrally clamped intheaprture.

For the purpose of retraction of the jaws from the aperturaeach jaw is provided with a stud 37 engagin a cam channel 38 cut in'the flange-l5 o the shell13.

This channel is cut spirally, as clearly-shown,

. in Figs. 3 and 4, so that the movem'entproduced thereby corresponds with-the aw movement produced by the internal cam;

faces and wedge 23. I 4 In viewbf he f0regoing,. a detailed descriptionof-the operation ofthe device-is deemed unnecessary and 5 is therefore omitted. Changes and variations may be made in the structure by means of which the inven-.

tion is carried into (effect. The invention,

therefore, is not to be restricted to the precise details of the structure shown and de- What is claimed is '1.'In a chuck, thetcombination with an I annular shell having an internal cam face,

of ajaw movable toward the axis of'the shell and provided with a stud in one of its ends, a wedge interposed between the cam face andth'ejaw, a cam channel in the shell engagingthe stud, and a tool gripper carried by the jaw.

QQIn a chuck, the combination- -with an annular shell'havlng an :internal "Cam face,

direction inclined to the axis of the shell and provided with a stud in one of its ends, a wedge interposed between the cam face and the jaw, a cam channel in the shell ongaging the stud, and a tool gripper carried by thejaw. y

3; In a chuck, the. combination with an annular shell having an internal cam face, of a jaw movable radially toward and in a direction inclined to the axis of the shell and provided with a stud in one of its ends,

a floatin wedge interposed between the cam face an the jaw, a cam channel in the shell engaging the stud, and a tool gripper carried by the jaw.

4. In a chuck, the combination with an annular shell havinga plurality of internal 'camfaces, of a plurality of ja'wsmovable .ra'diallytoward and in'directions inclinedto the axis of the shell and each provided with a stud in one of its ends, a plurality of floating wedges interposed betweenthc cam faces and j aws, a plurality of cam channels in the shell one enqaging each of the studs, a plurality of tool grippers one carried by each jaw and each provided with'a stud, and a controlling member having a series of slots enga ing the gripper studs.

annular shell having a plurality of internal cam faces, of a plurality of jaws movable radially toward and in directions inclined to the axis of the shell and each provided of a jaw movable radially toward and in a 5.In a chuck, t e combination with an' with a stud in one ofv its ends, a plurality "of floating wedges interposed between the cam faces and the jaws, a plurality of cam ch'annels in the shell one engaging each o'f-the studs, a plurality of rockingtool grippers one carried by each of the jaws and each provided with a stud, and a conical plate aving a series oft slots engaging the gripper studs.

In testimony whereof, I havesigned' my name to this speclfication in the presence of two subscribing witnesses.

I VERNER J WAl-ILSTBOM.

Witne'sses: J. DuH- BERGEN, H. O'r'ro Cmussnn. 

